LU-7121 tests: Extra items shown in the stack trace in t-f

LU-7121 tests: Extra items shown in the stack trace in t-f

The call to functions error_exit(), error_noexit(), error()
in turn call function log_trace_dump().

This call along with important information about where the
particular test failed shows some extra information in the
dump trace.

This changes fix the problem noticed and dumps only the relevant
information instead.

Signed-off-by: Parinay Kondekar <parinay.kondekar@seagate.com>
Change-Id: I5fba23f6e296e77feb0339c5e20815c288b8b751
Seagate-Bug-Id: MRP-891
Reviewed-on: http://es-gerrit.xyus.xyratex.com:8080/721/
Tested-by: Jenkins
Reviewed-by: Elena V. Gryaznova <elena.gryaznova@seagate.com>
Tested-by: Elena V. Gryaznova <elena.gryaznova@seagate.com>
Reviewed-by: Kyrylo Shatskyy <kyrylo_shatskyy@xyratex.com>
Signed-off-by:  Kyrylo Shatskyy <kyrylo_shatskyy@xyratex.com>
Reviewed-on: http://review.whamcloud.com/16338
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: James Nunez <james.a.nunez@intel.com>
Reviewed-by: Wei Liu <wei3.liu@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>